It is hard to say for sure what your regulator is going to control voltage at and without know what type of batteries you have it is hard to know what voltage it should be. Normal car alternators control at about 14.4v. A lead-acid battery is considered to be fully charged when the resting voltage is at 12.7v... But that is after it has set for a while or once the the "overcharge" has been removed.
You most likely did no damage if the alternator is still putting out a charge and 13.5v is definitely a charge. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Jul 20, 2016 10:55 AM, "Lorne Serpa via CnC-List" <cnc-list@cnc-list.com> wrote: > Hum, I. New to this boat and boats with diesel engines. Numerous times > past couple weeks have turned key off without killing the engine. I have a > 20gm. How do I know if I did damage? Check battery voltage while engine is > running? Should be 13.5 or so? > > Lorne Serpa > C&C 30MKII 1988 > Friendship, MD > On Jul 20, 2016 12:50 AM, "Leslie Paal via CnC-List" < > cnc-list@cnc-list.com> wrote: > >> Small correction: >> "The sudden high >> current overheats the diodes and they fail open" >> When the battery is disconnected while the alternator is charging the >> existing field current will generate a high voltage spike that exceeds the >> reverse voltage breakdown value. Normal diodes are rated for 60-100V >> reverse voltage. The spike can be lot more; depending how high was the >> charging current (more>higher). The P/N junction will punch through, the >> resulting localized current can make it open or short. >> >> Overloading forward (normal direction) current will heat the chip and the >> carefully placed 'impurities' will migrate and make the diode a little or >> lot leaky. Unless you fuse the internal connection, the open. >> >> Leslie. >> Phoenix C&C32 1983 >> >> -------------------------------------------- >> On Tue, 7/19/16, Josh Muckley via CnC-List <cnc-list@cnc-list.com> wrote: >> >> Subject: Re: Stus-List Relocating the Yanmar key now alternator.. >> To: "C&C List" <cnc-list@cnc-list.com> >> Cc: "Josh Muckley" <muckl...@gmail.com> >> Date: Tuesday, July 19, 2016, 9:31 AM >> >> I have heard >> all of this before and am still electrically confused. I >> have a few theories but no proof. In the face of my >> theories is the fact that it is not consistently >> repeatable. So here goes. >> Turn the battery off while running and the >> alternator suddenly goes to full output kinda like shifting >> to 1st while going 70mph. I get that. The sudden high >> current overheats the diodes and they fail open. >> Turn the key off while running and one of two >> things happens. 1st option is that nothing about the >> alternator is wired to the ignition and nothing happens. I >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you >> like what we do, please help us pay for our costs by donating. All >> Contributions are greatly appreciated! >> > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > like what we do, please help us pay for our costs by donating. All > Contributions are greatly appreciated! > >
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